Hakobyan, H., Hamdi, A., Han, S. et al. (81 more authors) (2019) First Measurement of Near-Threshold J /ψ Exclusive Photoproduction off the Proton. Physical Review Letters. 072001. ISSN: 1079-7114
Abstract
We report on the measurement of the γp→J/ψp cross section from Eγ=11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section dσ/dt has an exponential slope of 1.67±0.39 GeV-2 at 10.7 GeV average energy. The LHCb pentaquark candidates Pc+ can be produced in the s channel of this reaction. We see no evidence for them and set model-dependent upper limits on their branching fractions B(Pc+→J/ψp) and cross sections σ(γp→Pc+)×B(Pc+→J/ψp).
Metadata
| Item Type: | Article |
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| Authors/Creators: |
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| Copyright, Publisher and Additional Information: | © 2019 American Physical Society |
| Dates: |
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| Institution: | The University of York |
| Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
| Depositing User: | Pure (York) |
| Date Deposited: | 03 Sep 2019 15:50 |
| Last Modified: | 17 Sep 2025 01:35 |
| Published Version: | https://doi.org/10.1103/PhysRevLett.123.072001 |
| Status: | Published |
| Refereed: | Yes |
| Identification Number: | 10.1103/PhysRevLett.123.072001 |
| Related URLs: | |
| Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:150404 |
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